CN103868190B - A kind of energy-saving control method being applicable to central air conditioning cooling water system - Google Patents
A kind of energy-saving control method being applicable to central air conditioning cooling water system Download PDFInfo
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- CN103868190B CN103868190B CN201210533199.5A CN201210533199A CN103868190B CN 103868190 B CN103868190 B CN 103868190B CN 201210533199 A CN201210533199 A CN 201210533199A CN 103868190 B CN103868190 B CN 103868190B
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Abstract
A kind of energy-saving control method being applicable to central air conditioning cooling water system, relates to central air conditioner system control field.Energy-saving control method step of the present invention is as follows: 1. open number of units state according to cold, determines the unlatching of corresponding water pump number of units.2. gather cooling water supply and return water temperature to compare with supply backwater temperature difference setting value, calculate cooling pump rotating speed according to comparative result.3. the running frequency of cooling water pump is determined by result of calculation scope.4. according to frequency needed for below equation calculating blower fan of cooling tower:5. blower fan of cooling tower is fully open, unified frequency conversion.The inventive method both ensures to reduce self energy consumption of cooling system, can solve again the uneven and mixed water problems of waterpower, make whole cold side be under efficient energy-saving running status.
Description
Technical field
The present invention relates to central air conditioner system control field, especially for cooling water system in water-cooled central air-conditioning
The energy-saving control method of system.
Background technology
Cooling water system energy consumption is the important component part of central air conditioner system energy consumption, the central air conditioner system most of the time
Run at part load, then cooling water system also should be adjusted with load variations, in order to ensures and system radiating demand
Whole matching, reaches the energy-conservation of cooling water system.
In prior art, the general cooling water pump of water-cooled central air-conditioning cooling water system and cooling tower are all fixed frequency control
System, by taking cooling water pump and cooling tower unit number control to realize and the mating of system radiating amount changes in demand, generally basis
Cold is opened number of units and is fixed number of units combination.When this control method can only meet the unlatching of varying number cold to a certain extent
The change of load, carries out match control the most accordingly for system loading change time constant of the cold number of units, causes cooling water pump
It is at higher energy consumption level with blower fan of cooling tower.Meanwhile, in actual application, generally multiple stage cooling tower is in parallel, due to some
Random factor, when cooling tower valve switch, can cause the waterpower distribution imbalance of whole cooling system, occur to sluice and mend
Water.So in actual use, even if some blower fan of cooling tower is closed, being the most also not turned off corresponding water valve, this results in
Serious mixed water problems, makes coolant water temperature be difficult to be effectively reduced, causes the increase of cold energy consumption.
Summary of the invention
For above-mentioned deficiency of the prior art, it is an object of the invention to provide one and be applicable to central air-conditioner cooling water system
The energy-saving control method of system.It both ensures to reduce self energy consumption of cooling system, can solve again the uneven and mixed water of waterpower and ask
Topic, makes whole cold side be under efficient energy-saving running status.
In order to reach foregoing invention purpose, technical scheme realizes as follows:
A kind of energy-saving control method being applicable to central air conditioning cooling water system, step is as follows:
Open number of units state according to cold, determine the unlatching of corresponding water pump number of units.
Gather cooling water supply and return water temperature to compare with supply backwater temperature difference setting value, calculate cooling pump according to comparative result and turn
Speed.
When result of calculation is in the range of water pump operation frequency limit, cooling water pump runs according to result of calculation；When calculating knot
Fruit runs according to water pump operation low-limit frequency less than water pump operation frequency minimum, cooling water pump；When result of calculation is higher than water pump
The highest limit of running frequency, cooling water pump runs according to water pump operation highest frequency.
According to frequency needed for below equation calculating blower fan of cooling tower:
Blower fan of cooling tower is fully open, unified frequency conversion；When blower fan frequency result of calculation is in fan operation frequency limit scope
In, blower fan of cooling tower all runs according to result of calculation；When result of calculation is less than running frequency minimum, according to running lowest frequency
Rate is run；When result of calculation is higher than the highest limit of running frequency, run according to running highest frequency.
Due to the fact that and have employed said method, it is achieved cooling water system and the Proper Match of cold load, cold in guarantee
While machine radiating effect, reduce cooling water system self energy consumption.The inventive method makes full use of existing cooling tower heat-transfer surface
Long-pending, reducing blower fan of cooling tower power consumption simultaneously, effectively reducing cooling water supply temperature, it is achieved handpiece Water Chilling Units and cooling water system
Dual energy-saving effect.
The invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart.
Detailed description of the invention
Referring to Fig. 1, the energy-saving control method that the inventive method is applicable to central air conditioning cooling water system is as follows, water therein
Pump frequency reasoning and calculation method is as a example by PID control, but is not limited to this:
Open number of units state according to cold, determine the unlatching of corresponding water pump number of units；
Gather cooling water supply and return water temperature to compare with supply backwater temperature difference setting value, calculate cooling pump according to comparative result and turn
Speed；Cooling water pump rotating speed=Kp* temperature deviation+Ki* temperature deviation, Kp, Ki value need to adjust according to field control effect and determine.
When result of calculation is in the range of water pump operation frequency limit, cooling water pump runs according to result of calculation；When calculating knot
Fruit runs according to water pump operation low-limit frequency less than water pump operation frequency minimum, cooling water pump；When result of calculation is higher than water pump
The highest limit of running frequency, cooling water pump runs according to water pump operation highest frequency.
According to frequency needed for below equation calculating blower fan of cooling tower:
Blower fan of cooling tower is fully open, unified frequency conversion；When blower fan frequency result of calculation is in fan operation frequency limit scope
In, blower fan of cooling tower all runs according to result of calculation；When result of calculation is less than running frequency minimum, according to running lowest frequency
Rate is run；When result of calculation is higher than the highest limit of running frequency, run according to running highest frequency.
Cooling water pump, blower fan of cooling tower running frequency bound in above-described embodiment are wanted according to the minimum discharge of cold
Ask, the system practical situation such as pipe resistance characteristic requirements, water pump fan efficiency curve determines.
In the inventive method, by whole group of cooling tower Simultaneous Switching of condominium, according to heat dissipation capacity demand synchronous frequency conversion.Cooling water
Supply water temperature and supply backwater temperature difference jointly reflect the demand of cold heat dissipation capacity, cooling water supply temperature is mainly by cooling tower wind
Machine rotating speed and outdoor environment temperature impact, the change of supply backwater temperature difference reflects cold the most to a certain extent to cooling current
The demand of amount.So, the inventive method cooling water pump rotation speed change controls cooling range.Meanwhile, according to working as heat exchange area
One timing, the cooling water pump frequency of cold side optimum becomes obvious linear relationship with blower fan of cooling tower frequency, defines this linear ratio
Example coefficient is edema due to wind pathogen ratio, after cooling water pump rotating speed determines, compares relation according to edema due to wind pathogen, it may be determined that corresponding optimum blower fan turns
Speed.
Claims (1)
1. being applicable to an energy-saving control method for central air conditioning cooling water system, step is as follows:
1. open number of units state according to cold, determine the unlatching of corresponding water pump number of units；
2. gather cooling water supply and return water temperature to compare with supply backwater temperature difference setting value, calculate pump rotary speed according to comparative result；
3. when result of calculation is in the range of water pump operation frequency limit, water pump runs according to result of calculation；When result of calculation is less than
Water pump operation frequency minimum, water pump runs according to water pump operation low-limit frequency；When result of calculation higher than water pump operation frequency
High limit, water pump runs according to water pump operation highest frequency；
4. according to frequency needed for below equation calculating blower fan of cooling tower:
5. blower fan of cooling tower is fully open, unified frequency conversion；When blower fan frequency result of calculation is in the range of fan operation frequency limit,
Blower fan of cooling tower all runs according to result of calculation；When result of calculation is less than lower frequency limit, run according to lower frequency limit；Work as meter
When calculating result higher than upper limiting frequency, run according to upper limiting frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210533199.5A CN103868190B (en) | 2012-12-12 | 2012-12-12 | A kind of energy-saving control method being applicable to central air conditioning cooling water system |
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| CN201210533199.5A CN103868190B (en) | 2012-12-12 | 2012-12-12 | A kind of energy-saving control method being applicable to central air conditioning cooling water system |
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| CN103868190A CN103868190A (en) | 2014-06-18 |
| CN103868190B true CN103868190B (en) | 2016-12-21 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279805B (en) * | 2014-10-10 | 2017-07-04 | 武汉福星生物药业有限公司 | Operation control method for water-cooling screw type refrigerating unit |
| CN104566815B (en) * | 2014-12-26 | 2018-11-27 | 珠海格力电器股份有限公司 | Remote control system and control method for central air conditioner water system and central air conditioner |
| CN104534627B (en) * | 2015-01-14 | 2017-03-15 | 江苏联宏自动化系统工程有限公司 | Central air conditioning cooling water system comprehensive energy efficiency control method |
| CN104534628A (en) * | 2015-01-26 | 2015-04-22 | 珠海格力电器股份有限公司 | Control method and system of variable-frequency cooling water pump |
| CN104676834B (en) * | 2015-02-02 | 2017-06-23 | 韩冰 | The method for controlling cooling water system in refrigeration station system with pressure ratio based on ring temperature |
| CN107202398B (en) * | 2017-05-16 | 2019-07-26 | 珠海格力电器股份有限公司 | Central air-conditioning water system control method and device and readable storage medium |
| CN107178880A (en) * | 2017-07-03 | 2017-09-19 | 珠海格力电器股份有限公司 | method and device for controlling air conditioner |
| CN109387014A (en) * | 2018-10-26 | 2019-02-26 | 江苏亨通电力特种导线有限公司 | Industry cooling water controling method and system |
| CN110360868B (en) * | 2019-07-17 | 2020-06-26 | 珠海格力电器股份有限公司 | Cooling tower, method and device for adjusting upper limit frequency of variable frequency fan of cooling tower and air conditioning unit |
| CN111457542A (en) * | 2020-04-20 | 2020-07-28 | 宁波奥克斯电气股份有限公司 | Variable frequency water pump operation control method and device and air conditioning system |
| CN113739362A (en) * | 2021-09-22 | 2021-12-03 | 广东电网有限责任公司 | Energy consumption determination method, device and equipment for air conditioning system and storage medium |
| CN113883663A (en) * | 2021-09-30 | 2022-01-04 | 珠海格力电器股份有限公司 | Method and device for controlling outlet water temperature of cold machine and air conditioning equipment |
| CN114576806A (en) * | 2022-02-17 | 2022-06-03 | 华设设计集团股份有限公司 | Central air-conditioning cooling water system energy-saving optimization method based on variable frequency control |
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| JP2007315717A (en) * | 2006-05-29 | 2007-12-06 | Hasegawa Electric Industry Co | Operation control method for cold/hot water pump in air conditioning facility |
| JP2008151481A (en) * | 2006-12-20 | 2008-07-03 | Kawasaki Thermal Engineering Co Ltd | Energy-saving control operation method and device for refrigerating machine |
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